数据库查找

import java.sql.*;

 

import java.util.Scanner;

 

public class jdbcselect {

    public static void main(String[]args) {

        final String URL = "jdbc:mysql://localhost:3306/test";

        final String USERNAME = "root";

        final String PWD = "12345";

        Connection connection = null;

        Statement  stmt = null;

        ResultSet rs = null ;

        Scanner con=new Scanner(System.in);

        String idnumber;

        String classname;

        String teachername;

        String didian;

 

        teachername=con.nextLine();

        /*teachername=con.nextLine();

        didian=con.nextLine();*/

        try {

            // a.导入驱动，加载具体的驱动类

            Class.forName("com.mysql.jdbc.Driver");// 加载具体的驱动类

            // b.与数据库建立连接

            connection = DriverManager.getConnection(URL, USERNAME, PWD);

            stmt = connection.createStatement();

             

             

            //String sql = "select * from student where teacher='"+teachername+"'  " ;

            String sql = "select * from student where teacher like '%"+teachername+"%'  " ;

         

            // 执行SQL

            rs = stmt.executeQuery(sql);

             

            // d.处理结果

             

          

                 

                while(rs.next()) {

                    String id=rs.getString("id");

                    System.out.println(id);

                    }

                 

             

        } catch (ClassNotFoundException e) {

            e.printStackTrace();

            System.out.println("1");

        } catch (SQLException e) {

            e.printStackTrace();

            System.out.println("3");

        } catch(Exception e) {

            e.printStackTrace();

            System.out.println("2");

        }

        finally {

            try {

                 if(stmt!=null) stmt.close();// 对象.方法

                 if(connection!=null)connection.close();

            }catch(SQLException e) {

                e.printStackTrace();

            }

        }

    }

 

 

}